Tamping device



Jan. 23, 1962 s, JACKLIN 3,017,810

TAMPING DEVICE Filed Dec. 15, 1957 United States Patent Oflice 3,017,810 Patented Jan. 23, 1962 3,017,810 TAMPING DEVICE Stan E. Jacklin, Nipawin, Saskatchewan, Canada Filed Dec. 13, 1957, Ser. No. 702,700 1 Claim. (Cl. 94-48) The present invention relates to the art of tamping or compacting material and is particularly directed to a devjirce utilizing eccentric means for creating a compacting e ort.

In the art of pouring concrete pipes it is necessary to compact the concrete aggregate in order to produce a resulting article having the required density. The present invention is specifically designed for this purpose, but is also suitable for use in equivalent applications where loose materials must be compacted.

The present invention comprises a shoe of suitable conformation to contact and compact the loose material. This shoe is caused to oscillate vertically by means of an eccentric mechanism connected to the shoe by means of a shaft. In addition the shoe rotates about a vertical axis which tends to prevent movement of the shoe with respect to the material being tamped. Resilient means support the shaft in a fixed mounting and restrict vertical and rotational movement of the shaft.

With reference to the accompanying drawings the device will be described in detail:

FIGURE 1 is an elevation of the device.

FIGURE 2 is a cross-section of the eccentric means.

FIGURE 3 is a vertical section showing details of the lower mounting means.

FIGURE 4 is a cross-section of the upper mounting means.

FIGURE 5 discloses an alternate method of attaching the shoe to the shaft.

'In FIGURE 1 means to impart rotational motion to the eccentric means is shown at 1 and may comprise an electric motor. Equivalent drive means having a rotational power output could be employed.

The driving means 1 is connected to the eccentric device by means of a pulley 2 and a flexible belt 3. The belt 3 runs in a groove as shown in the pulley 2 and a similar groove in the pulley or rotor 4 of the eccentric means.

The rotor 4 is eccentrically mounted on shaft 5 and when rotated by the driving mechanism 1 will create a vertical movement in the shaft 5. The rotor support shaft 5 is supported by bearings 6 which are mounted on hangers or brackets 7 which are rigidly connected to the main shaft 8 which carries on its lower end and secured thereto a tamping head 9.

The tamping head 9 may be of any desired shape and is not restricted to the particular conformation disclosed.

An outer tube 10 of a larger diameter than the shaft 8 surrounds the upper portion of the shaft 8. A bracket 11 or other equivalent means is connected to the outer tube 10 by the clamp 12 and to the driving mechanism by a mounting bracket shown generally at 13.

The main shaft 8 is concentrically mounted within the housing 10 by means of upper and lower annular guides shown generally at 14 and 15 respectively.

The upper annular guide 14 is more easily understood by reference to FIGURE 4 and consists of a housing portion 16 of suitable cross section and somewhat larger in diameter than the tube 10 and embracing the upper end of the tube and either formed integrally with the tube or of separate portions rigidly secured thereto. The hous- 2. ing 16 is open at its upper end and said housing contains a fin 17 radially extending from the shaft 8. The fin 17 and in turn the shaft 8 is restricted in rotational movement by means of the resilient members 18 which are secured to a peripheral wall of the guide member 14 and preferably engage a portion of the shaft 8 and fin 17. The elements 18 may be in the form of rubber cushions, springs or the like and in co-operation with the fin restrict, as mentioned above, the rotational movement of shaft 8 but do permit a certain small amount of rotational movement.

Excessive vertical movement of the shaft 8 is prevented by means of lower annular guide 15. The lower end of the outer tube 10 is embraced by an annular member 19 having an opening 20 of smaller diameter than the tube 10 but just slightly greater than the shaft 8. The lower wall of the member 19 is dished, and the lateral wall is cylindrical to embrace and engage the lower end of the tube 10 to which it is attached by suitable means.

Rigidly fastened to the shaft -8 is a radial plate 21 of smaller diameter than the outer tube 10. The plate 21 oscillates with the shaft 8 and acts against resilient material as shown generally at 22. The material 22 may be in the form of rubber pads or may be other equivalent material such as springs. The resilient material is confined in the guide 15 by the lower dished member 19 and by an inverted upper dished member 23 of similar configuration but oppositely disposed to member 19.

The clamp 12 which connects the outer tube 10 and the supporting member 11 may be adjusted to the desired position on the outer tube to permit assembly and disassembly and also of a ready easy method of adjusting the tension of drive belt 3.

In FIGURE 5 an alternate method of securing the shoe to the shank is disclosed which provides for a more secure fastening of the two elements. In this example the walls of the shaft 8 are split as shown at 24, the resulting ears 25 are secured to an upwardly projecting stub portion of the shoe 9 that is inserted in the tube 8. As shown in dotted lines in FIGURE 5, the stub portion of the shoe is secured in the split tube 8 by a suitable screw and nut 26 that are adapted to extend through the tube and stub portion of the shoe.

It will be evident from the above description that there has been provided a device of simple and sturdy construction but which provides extremely eflicient tamping action.

I claim:

A tamping device comprising a tube, a shaft concentrically arranged in the tube and extending below and above the lower and upper ends thereof, a tamping shoe on the lower end of the shaft, a guide member embracing the upper end of the tube, resilient members located between the shaft and the inner wall of the guide, a rotation resisting member on the shaft engaging the resilient members, a lower guide embracing the lower end of the tube, a resilient member located between the shaft and the inner face of the tube, a second resilient member located between the shaft and the inner peripheral wall of the lower guide, a flange carried by the shaft and coacting with the two last said resilient members, and vibrating means operatively connected to the upper end of the shaft, said vibrating means comprising a bracket mounted on the upper end of the shaft, a rotor eccentrically mounted in the bracket and formed with a peripheral groove, a drive pulley formed with a peripheral groove, a flexible belt co-acting with the grooves in the rotor and drive pulley, a bracket clamped to the tube in position to tension said belt, a prime mover mounted on the upper end of said bracket, said prime mover being operatively connected to the drive pulley and means for rotating said drive pulley.

References Cited in the file of this patent UNITED STATES PATENTS 2,043,442 McNeil June 9, 1936 4 Baily Mar. 8, 1938 Dobie et all. Feb. 17, 1948 Berthet May 1, 1956 FOREIGN PATENTS Germany Dec. 24, 1943 Sweden Feb. 18, 1947 France June 27, 1951 

